title: The effect of low-frequency oscillations on cardio-respiratory synchronization: Observations during rest and exercise.
abstract: We show that the transitions which occur between close orders of synchronization in the cardio-respiratory system are mainly due to modulation of the cardiac and respiratory processes by low-frequency components. The experimental evidence is derived from recordings on healthy subjects at rest and during exercise. Exercise acts as a perturbation of the system that alters the mean cardiac and respiratory frequencies and changes the amount of their modulation by low-frequency oscillations. The conclusion is supported by numerical evidence based on a model of phase-coupled oscillators, with white noise and low-frequency noise. Both the experimental and numerical approaches confirm that low-frequency oscillations play a significant role in the transitional behavior between close orders of synchronization.
authors.affiliation: Department of Physics, University of Lancaster, Lancaster LA1 4YB, United Kingdom.
authors.forename: D A
authors.initials: DA
authors.lastname: Kenwright
authors.forename: A
authors.initials: A
authors.lastname: Bahraminasab
authors.forename: A
authors.initials: A
authors.lastname: Stefanovska
authors.forename: P V E
authors.initials: PV
authors.lastname: McClintock